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  Sportsmedicineexpertshaveobservedforyearsthatathletessuchaslongdistancerunnersespeciallywomenathletesoftendisplayalackofiron.NowanewstudybyateamofPurdueUniversityresearcherssuggeststhatevenmoderateexer

  Sportsmedicineexpertshaveobservedfor yearsthatathletessuchaslongdistancerunnersespeciallywomenathletesoftendisplayalackofiron.NowanewstudybyateamofPurdueUniversityresearcherssuggeststhatevenmoderateexercisemayleadtoreducedironinthebloodofwomen.

  "Wefoundthatwomenwhowerenormallyinactiveandthenstartedaprogramofmoderateexerciseofmiddledegreeshowedsingsofironloss"saysRoseanneM.LyleassociateprofessoratPurdue.Herstudyof62formerlyinactivewomenwhobeganexercisingthreetimesaweekforsixmonthswaspublishedinthejournalMedicine&ScienceinSports&Exercise.

  Irondeficiencyisverycommonamongwomeningeneralaffectingoneinfourfemaleteenagersandoneinfivewomenaged18to45respectively.Buttheratioisevengreateramongactivewomenaffectingupto80percentoffemaleenduranceathletes.ThismeansLylesaysthat"toomanywomenignoretheamountofirontheytakein".Womenofchild-bearingageareatgreatestrisksincetheirmonthlybleedingisamajorsourceofironloss.Plusmanyhealth-consciouswomenincreasetheirriskbyrejectingredmeatwhichcontainsthemosteasilyabsorbedformofiron.Andbecausewomenoftenrestricttheirdietinanefforttocontrolweighttheymaynotconsumeenoughiron-richfoodandareliabletoexperienceadeficiency.

  Exercisecanresultinironlossthroughavarietyofmechanisms.Someironislostinsweatandforunknownreasonsintenseenduranceexerciseissometimesassociatedwithbleedingofthedigestivesystem.Athletesinhigh-impactsportssuchasrunningmayalsoloseironthroughaphenomenonwheresmallbloodvesselsinthefeetleakblood.

  Therearethreestagesofirondeficiency.Thefirstandmostcommonishavinglowironreservesaconditionthattypicallyhasnosymptoms.Fatigueandpoorperformancemaybegintoappearinthesecondstageofdeficiencywhennotenoughironispresenttoformthemolecules(分子)ofbloodproteinthattransportoxygentotheworkingmuscles.Inthethirdandfinalstagepeopleoftenfeelweaktiredandoutofbreath-andexerciseperformanceisseverelycompromised.

  "Peoplethinkthatifthey'renotatthethirdstagenothingiswrongbutthat'snottrue"

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2019-04-23 17:54
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沈筱彦

  CBDD

2019-04-23 17:58:29

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